Re: [PATCH v13 00/11] Introduce support for guest CET feature

Yang Weijiang
2020-07-15T00:40:38Z

On Mon, Jul 13, 2020 at 11:13:26AM -0700, Sean Christopherson wrote:
> On Wed, Jul 01, 2020 at 04:04:00PM +0800, Yang Weijiang wrote:
> > Control-flow Enforcement Technology (CET) provides protection against
> > Return/Jump-Oriented Programming (ROP/JOP) attack. There're two CET
> > sub-features: Shadow Stack (SHSTK) and Indirect Branch Tracking (IBT).
> > SHSTK is to prevent ROP programming and IBT is to prevent JOP programming.
> >
> > Several parts in KVM have been updated to provide VM CET support, including:
> > CPUID/XSAVES config, MSR pass-through, user space MSR access interface,
> > vmentry/vmexit config, nested VM etc. These patches have dependency on CET
> > kernel patches for xsaves support and CET definitions, e.g., MSR and related
> > feature flags.
> >
> > CET kernel patches are here:
> > https://lkml.kernel.org/r/20200429220732.31602-1-yu-cheng.yu@intel.com
> >
> > v13:
> > - Added CET definitions as a separate patch to facilitate KVM test.
> > - Disabled CET support in KVM if unrestricted_guest is turned off since
> > in this case CET related instructions/infrastructure cannot be emulated
> > well.
>
> This needs to be rebased, I can't get it to apply on any kvm branch nor on
> any 5.8 rc. And when you send series, especially large series that touch
> lots of code, please explicitly state what commit the series is based on to
> make it easy for reviewers to apply the patches, even if the series needs a
> rebase.
Sorry for the inconvenience, I'll rebase and resend this series.